Brake



Oct. 22, 1935. D. J. MARTIN 28,458

BRAKE Filed May 19, 1954 Patented Oct. 22, 1935 UNITED STATES PATENT OFFICE 9 Claims.

This invention-relates to a friction brake and has for an object to provide an improved construction for stopping the rotation of a wheel or wheels and. especially of the wheels of a train or locomotive by applying a tangential frictional boss at the periphery of the -wheel or wheels whose rotation is being stopped, the tangential force being applied by means of another wheel coming into contact with the periphery thereof, but having its periphery at the contact point rotating in an opposite direction to the periphery of the wheel to be stopped to thereby diminish or eliminate any additional pressure or force on the bearing of the wheel whose rotation is being stopped.

A further object of this invention is to apply a tangential force stopping the rotation of the wheel, the force being proportional tothe rotation of the wheel so that as the wheel slows down and comes to a stop the force will lessen and cease as the wheel is stopped.

A further object of this invention is to provide a braking wheel whose periphery may be moved into contact with the periphery of the wheel to be stopped to thereby apply a. tangential frictional force, the movement of the brake wheel preferably resulting from the movement of the Wheel itself by linking the brake wheel shaft to the wheel axle.

Still a further object of this invention is to provide means for restoring the proper and true taper on the'wheels of the locomotive or train Without the usual necessity of removing the wheels therefrom by temporarily substituting an abrasive wheel for the brake Wheel of this invention. Y

With the foregoing and other objects in View, as will hereinafter become apparent, this inventionV comprises the constructions, combinations and arrangements of parts hereinafter set forth, disclosed and shown on the accompanying drawing. In this drawing,

Figure 1 is a side elevation of the car truck wheels shown diagrammatically embodying the invention,

Figure 2 is a plan view of the same,

Figures 3 and 4 are diagrammatic views of modified forms of braking means,

Figure 5 is a side elevation of another modified form of brake,

Figure 6 is a side elevation of an abrasive wheel,

Figure '7 is a side elevation of the linkl sprocket Vwheel and chain, and

(Cl. 18K-80)` Figure 8 is a. side elevation of the control means of Figures 1 and 2.

.There is shown at I0 the car or locomotive wheels mounted on the usual axles II, the axles I I being mounted for vertical movement in their 5i bearings I2 on the car or locomotive frame I3. Supportedbetween the axle bearings I2 are the brake carrying frames I4 on which are supported bearings I5 for the brake shaft I6, there being one pair of bearings I5 for the upper brake shaft 10'.'

on top of frame I4, and another pair of bearings attached to the bottom of the frame I4 for the lower brake shaft.

The bearings I5 are mounted on the frame I4 ina manner similar to the conventional mount- 115`v ing of they bearings I2 on the car or locomotive frame I3 so that the shaft IB may move toward or-recede from each other, a compression spring I1 withinv a housing I8 being located between the shaft |61 to normally hold them away from 20 car wheels. Brake wheels I9 pinned or keyed to each end of the shaft` lpartake of any' rotation of the shaft I6, theshaft IB being caused to ro,- tate by means of sprocket chains 20 andY 2|, the chain 20 going to the upper shaft I6 and the 25 chain 2| to the lower shaft I6. Sprocket gears 22 are fixed to the axles II and shaft I6 inthe manner shown in Figures 1 and '7. These sprocket gears122 are sweated on to the shaft IB and axles I I by removing one of the pins 23r from 30` one of the connecting links 24 heating thechain to cause it to expand, placing it around the shaft or axle, driving in the pinagain so that when the links contract the sprocket gear is held securely onthe shaft or axle, thus eliminating the 35 necessity of disassembling the car wheels or brake wheels from thev axles or shaft in order to place the sprocket chain in position.f

Each brake-shaft I6 extends through a central control bearingv 25, the bearings 25 each 40 being. provided. with apertured bosses 26 which are pivotally connectedby bolts 21 and 28 to contro1 levers 29 and 3U, the`control levers 29` and 30 being pivoted together as at 3|. An operating lever 32 is pivoted to the lever 30.

In operation the operating lever 32 is moved in the direction of the arrow by any suitable. control or connecting rods located in the cab of the locomotive causingthe pivot points 21 and 28` to be drawn closer together, thereby causing thel central bearings 25 toapproach each other and carry the brake shaft I6 toward. each other compressing thespring I'I and bringing the brake wheels I9 into contact with the ear Wheels` I0.

As will be observed,.the periphery of the-brake 69fwheels I9 will then come into contact with the periphery of the car wheels I0, the periphery of the brake wheels I9 having a complementary taper to the periphery of the car wheels I0. Due to the chains 20 and 2|, the brake wheels I9 will each be continuously rotated, so that when the periphery of the brake wheels I9V come into contact with the peripheryof the car wheels I0, they will each be rotated in opposite directions so that the brake wheels will apply a tangential force tending to slow the rotation of the car wheels I0 and thus giving an effective braking course and slowing the rotation of the car Wheels I0 without however applying any increased pressure to the car Wheel bearings I2, thus preventing the car wheel bearings I2 from wearing out at an increased rate due to operation of a'brake.

With the present system the quickestway of stopping a train or locomotive is to cause the wheels to rotate in a reverse direction whereby the tangential force of the tracks will be in a direction opposite to the rotationof the wheels. The brake wheels I9 apply this same tangential forceV against the rotation of the wheels Ill and help the train to stop quite rapidly.

An additional feature of this invention is the Y provision'of an abrasive wheel 33 shown in Figure 6. This abrasive Wheel 33 may be substituted for the brake wheels I9 and the abrasive wheel 33 has the proper taper on its periphery 34 so that when temporarily substituted for the brake wheels i9 the abrasive wheel 33 may be operated against the car wheels I0 to restore the proper taper thereto, thereby eliminating fiat spots on the car wheels and eliminating the necessity for removing the car wheels from the car or locomotive in order to true up the taper thereon.

A different form of this invention is shown in Figure 3 wherein the brake may be applied in Aeither direction, irrespective of which way the train is travelling. In this case the shafts of the brake wheels I9 are mounted on a frame 35. which is pivoted at its center 36. A single chain 31 is connected about the axles II of the car wheels VIII 'and over the shaft of the brake wheels I9.

A control lever 38 may shift the frame 35 about its center in either direction as the operating rod 39 is moved back or forward as shown by the ar-V row depending on which direction the car is Itravelling. When travelling in one direction the upper brake wheels I9 will apply to one set of car wheels I0 and therlower wheels I9 to the other set of car wheelsV I0, and when the train istravelljng in opposite directions then the brake wheels I9 will be rotated about the center 36 to apply to the opposite direction of car wheels.

A very much simplied form of the invention is shown in Figure 4, wherein one set of Vbrake wheels I9 is brought against the car wheels I9, being mounted on a frame'40 and pivoted at 4I V,to a support 42, the operating lever 43 apply-j Y ing the brake when moved in the direction of the arrow to pivot the frame 40 on its support 42.

In Figure 5 the brakewheel I9 is moved in a transverse direction to come into contact withv the car wheels I0. The brake wheel I9 in this case is mounted on a sleeve 46, which is :splined' on a shaft 52 operated either in the same manner as the forms already described, or by a sep-V arate independent motor. A compression spring 59 between a collar 41 on sleeve 46 and a stop 5I Y on shaft 52tendsto Yurge the sleeve 4B and brake wheel I9 transversely away from the car wheel I0, the'taper of the car wheel and brakefwheel Y allowing the wheels to separate' on transverse movement. A bel1 crank lever 49 pivoted as at 46 may be operated by an operating lever 53 in the direction of the arrow to apply the brake, the spring 50 serving to return the brake to nonoperative positionfwhen the operating lever 53 5 is released.

The novel features and the operation of this device will be apparent from the foregoing description. While the device has been shown and the structure described in detail, it is obvious l0 that this is not to be considered limited to the exact form disclosed and that changes may be made therein within the scope of what is claimed without departing from the spirit of the invention. 15

braking wheel into tangential contact with the 25k.

wheel, whereby the contacting point of the wheel and of the braking wheel will be moving in opposite directions, and means normally urging said braking wheel out of contact with the Wheel.

2. Means for applying a tangential frictional force to the periphery of a rotating Vwheel comprising a braking wheel, means for continuously rotating the periphery of the braking wheel in the same axial direction as the wheel and in direct proportion to the rotating speed thereof, means for moving said already continuously rotating braking wheel into tangential contact with the wheel, whereby the contacting point of the wheelV and of the braking wheel will be moving in opposite directions, and means normally urging said o braking wheelout of contact with the wheel, said means for rotating said braking wheellbeing operated by the rotation of the Wheel to be braked,

' 3. Means for applying a tangential frictional force to the periphery of a wheel comprising a 45 braking wheel, means for simultaneously and continuously rotating the periphery of Vthe braking wheel in. the same axial direction as theV wheel, means for moving said already continuously rotating braking wheelinto tangential con? tact with the wheel, whereby the contacting point of the wheel and of the braking wheel will be moving in opposite directions, means normally urging said braking wheel out of contact with the wheel, said means for rotating said braking wheel 55 e being operated by the rotation ofthe wheel to be braked, said brake wheel rotating'means com- Y prising a brake wheel shaft, a link sprocket on. the brake wheel shaft, and a sprocket chain ro-V tated by the rotationof the wheel to be braked.

4. Means for applying a tangential frictional force to the periphery of awheelcomprising a braking wheel, means for simultaneously and con` tinuously rotating the periphery of the braking wheel in the same axial direction as the wheel, means for moving said already continuously ro-V tating braking wheel into tangential contact withr the wheel, whereby the contacting point of the wheel and of the braking 'wheel will be moving in opposite directions, means normally urging said braking wheel out of contact with the wheel, said means for rotating said braking wheel being operated by the rotation of the wheel to be braked, said brake wheel rotating means comprising a brake wheel shaft, a link sprocket on the brake u Y wheel shaft, a sprocket chain rotated by the rotation of the Wheel to be braked, and an operative rod under the control of an operator for operating said means to move the braking Wheel into contact with the wheel to be braked.

5. A braking system for car wheels rotatable with car Wheel axles in a car, comprising a pair whereby said rotating braking wheel will come into peripheral tangential contact with said car wheel.

6. A braking system for car wheels rotatable with car Wheel axles in a car, comprising a pair of rotatable brake shafts, means directly connecting said brake shafts to the car wheel axles for continuous rotation therewith, braking wheels mounted on the end of said rotatable brake shaft, said braking Wheels being mounted in the same plane as said car wheels, means moving said rotating brake shaft in the direction of said car axle whereby said braking Wheel will come into peripheral tangential contact with said car wheel, and means normally urging said brake shaft in an opposite direction.

7. A braking system for trains comprising in combination with the car trucks having a plurality of pairs of car wheels iixedly mounted on rotatable axles, a brake shaft for each car wheel axle, means for mounting said brake shafts for movement toward and from their respective car wheel axles, means for continuously rotating said brake shafts directly operated by the rotation of said car wheel axles, a brake wheel mounted on each end of said brake shafts in the same plane with the car wheels, whereby the brake wheels will partake of the same axial rotation as said car wheels, and may be moved into tangential contact with said car wheels.-

8. A braking system for trains comprising in combination with the car trucks having a plurality of pairs of car wheels i'lxedly mounted on rotatable axles, a brake shaft for each car wheel axle, means for mounting said brake shafts for movement toward and from the car wheel axles, means for continuously rotating said brake shafts directly operated by the rotation of said car wheel axles, a brake wheel mounted on each end of each of said brake shafts in the same plane with the car wheels, whereby the brake wheels will partake of the same axial rotation as said car wheels, and may be moved into tangential contact with said car wheels, and means under the control of an operator simultaneously moving said brake shafts toward their respective car Wheel axles.v

9. In the braking system as set forth in claim 5, wherein said braking wheels are each removably mounted on said brake shafts for replacement by an abrasive wheel for grinding the periphery of the car wheels and trueing the taper thereof.

DOUGLAS J. MARTIN. 

